But she was the best and most conscientious of stepmothers, and back I had to go to my room.
Though refusing, from conscientious scruples, to bear arms against land invaders, yet himself had illimitably invaded the Atlantic and Pacific; and though a sworn foe to human bloodshed, yet had he in his straight-bodied coat, spilled tuns upon tuns of leviathan gore.
Nor are the most conscientious compilations of Natural History for the benefit of the young and tender, free from the same heinousness of mistake.
Uncommonly conscientious for a seaman, and endued with a deep natural reverence, the wild watery loneliness of his life did therefore strongly incline him to superstition; but to that sort of superstition, which in some organizations seems rather to spring, somehow, from intelligence than from ignorance.
For, though himself and boat’s crew remained untainted, and though his ship was half a rifle-shot off, and an incorruptible sea and air rolling and flowing between; yet conscientiously adhering to the timid quarantine of the land, he peremptorily refused to come into direct contact with the Pequod.
…is scrubbed and placed upon the try-works, completely hiding the pots; every cask is out of sight; all tackles are coiled in unseen nooks; and when by the combined and simultaneous industry of almost the entire ship’s company, the whole of this conscientious duty is at last concluded, then the crew themselves proceed to their own ablutions; shift themselves from top to toe; and finally issue to the immaculate deck, fresh and all aglow, as bridegrooms new-leaped from out the daintiest…
Moreover, as if perceiving at last that if he should give undiluted conscientious advice to Pip, he would be leaving him too wide a margin to jump in for the future; Stubb suddenly dropped all advice, and concluded with a peremptory command, "Stick to the boat, Pip, or by the Lord, I won’t pick you up if you jump; mind that.
There are no more uses of "conscientious" in the book.